To the extent that this is true, I think it is because, as a practical matter, the CFP has nationalized the sport (a lot more than it already was).
In the CFP era, if you are a high end midwestern recruit and you want to stay somewhat close to home and play for CFP titles, you have one choice: Ohio State.
In a more regional area there was at least a chance the another School might play for the top prize ( League Title, Rose Bowl). Now, not really. Two other midwestern schools have been to the CFP but they both got run off the field in the semi-final. Ohio State has also been run off the field in a semi-final once but in their other appearance they beat big bad Bama and won the whole thing.